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- PDB-9kdg: CryoEM structure of Calcineurin-fusion Human endothelin receptor ... -

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Basic information

Entry
Database: PDB / ID: 9kdg
TitleCryoEM structure of Calcineurin-fusion Human endothelin receptor type-B in the ligand-free form
Components
  • Calcineurin-fusion endothelin receptor type-B
  • Peptidyl-prolyl cis-trans isomerase FKBP1B
KeywordsMEMBRANE PROTEIN / GPCR
Function / homology
Function and homology information


positive regulation of sequestering of calcium ion / cyclic nucleotide binding / negative regulation of calcium-mediated signaling / negative regulation of insulin secretion involved in cellular response to glucose stimulus / negative regulation of release of sequestered calcium ion into cytosol / neuronal action potential propagation / insulin secretion involved in cellular response to glucose stimulus / response to redox state / : / 'de novo' protein folding ...positive regulation of sequestering of calcium ion / cyclic nucleotide binding / negative regulation of calcium-mediated signaling / negative regulation of insulin secretion involved in cellular response to glucose stimulus / negative regulation of release of sequestered calcium ion into cytosol / neuronal action potential propagation / insulin secretion involved in cellular response to glucose stimulus / response to redox state / : / 'de novo' protein folding / negative regulation of heart rate / FK506 binding / positive regulation of axon regeneration / channel regulator activity / smooth muscle contraction / response to vitamin E / calcium channel inhibitor activity / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / T cell proliferation / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / Ion homeostasis / release of sequestered calcium ion into cytosol / sarcoplasmic reticulum membrane / calcium channel complex / peptidyl-prolyl cis-trans isomerase activity / RNA polymerase II CTD heptapeptide repeat P3 isomerase activity / RNA polymerase II CTD heptapeptide repeat P6 isomerase activity / peptidylprolyl isomerase / calcium-mediated signaling / response to hydrogen peroxide / Stimuli-sensing channels / Z disc / positive regulation of cytosolic calcium ion concentration / protein refolding / transmembrane transporter binding / signaling receptor binding / membrane / cytoplasm
Similarity search - Function
: / FKBP-type peptidyl-prolyl cis-trans isomerase domain profile. / FKBP-type peptidyl-prolyl cis-trans isomerase domain / FKBP-type peptidyl-prolyl cis-trans isomerase / Peptidyl-prolyl cis-trans isomerase domain superfamily
Similarity search - Domain/homology
: / 8-DEETHYL-8-[BUT-3-ENYL]-ASCOMYCIN / Peptidyl-prolyl cis-trans isomerase FKBP1B
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.33 Å
AuthorsShihoya, W. / Akasaka, H. / Nureki, O.
Funding support Japan, 1items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS)21H05037 Japan
CitationJournal: Nat Commun / Year: 2025
Title: Structure of a lasso peptide bound ET receptor provides insights into the mechanism of GPCR inverse agonism.
Authors: Wataru Shihoya / Hiroaki Akasaka / Peter A Jordan / Anna Lechner / Bethany K Okada / Gabriella Costa Machado da Cruz / Fumiya K Sano / Tatsuki Tanaka / Ryo Kawahara / Rajan Chaudhari / ...Authors: Wataru Shihoya / Hiroaki Akasaka / Peter A Jordan / Anna Lechner / Bethany K Okada / Gabriella Costa Machado da Cruz / Fumiya K Sano / Tatsuki Tanaka / Ryo Kawahara / Rajan Chaudhari / Hiroko Masamune / Mark J Burk / Osamu Nureki /
Abstract: Lasso peptides exhibit a unique lariat-like knotted structure imparting exceptional stability and thus show promise as therapeutic agents that target cell-surface receptors. One such receptor is the ...Lasso peptides exhibit a unique lariat-like knotted structure imparting exceptional stability and thus show promise as therapeutic agents that target cell-surface receptors. One such receptor is the human endothelin type B receptor (ET), which is implicated in challenging cancers with poor immunotherapy responsiveness. The Streptomyces-derived lasso peptide, RES-701-3, is a selective inhibitor for ET and a compelling candidate for therapeutic development. However, meager production from a genetically recalcitrant host has limited further structure-activity relationship studies of this potent inhibitor. Here, we report cryo-electron microscopy structures of ET receptor in both its apo form and complex with RES-701-3, facilitated by a calcineurin-fusion strategy. Hydrophobic interactions between RES-701-3 and the transmembrane region of the receptor, especially involving two tryptophan residues, play a crucial role in RES-701-3 binding. Furthermore, RES-701-3 prevents conformational changes associated with G-protein coupling, explaining its inverse agonist activity. A comparative analysis with other lasso peptides and their target proteins highlights the potential of lasso peptides as precise drug candidates for G-protein-coupled receptors. This structural insight into RES-701-3 binding to ET receptor offers valuable information for the development of novel therapeutics targeting this receptor and provides a broader understanding of lasso peptide interactions with human cell-surface receptors.
History
DepositionNov 3, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0May 7, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Calcineurin-fusion endothelin receptor type-B
F: Peptidyl-prolyl cis-trans isomerase FKBP1B
hetero molecules


Theoretical massNumber of molelcules
Total (without water)116,3569
Polymers115,2702
Non-polymers1,0867
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 2 types, 2 molecules AF

#1: Protein Calcineurin-fusion endothelin receptor type-B


Mass: 102498.867 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Spodoptera frugiperda (fall armyworm)
#2: Protein Peptidyl-prolyl cis-trans isomerase FKBP1B / PPIase FKBP1B / 12.6 kDa FK506-binding protein / 12.6 kDa FKBP / FKBP-12.6 / FK506-binding protein ...PPIase FKBP1B / 12.6 kDa FK506-binding protein / 12.6 kDa FKBP / FKBP-12.6 / FK506-binding protein 1B / FKBP-1B / Immunophilin FKBP12.6 / Rotamase / h-FKBP-12


Mass: 12771.512 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: FKBP1B, FKBP12.6, FKBP1L, FKBP9, OTK4 / Production host: Escherichia coli (E. coli) / References: UniProt: P68106, peptidylprolyl isomerase

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Non-polymers , 4 types, 7 molecules

#3: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Ca
#4: Chemical ChemComp-FE / FE (III) ION


Mass: 55.845 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Fe
#5: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#6: Chemical ChemComp-FK5 / 8-DEETHYL-8-[BUT-3-ENYL]-ASCOMYCIN / K506


Mass: 804.018 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C44H69NO12 / Comment: medication*YM

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Details

Has ligand of interestN
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1Calcineurin-fusion Human endothelin receptor type-B in the ligand-free formCOMPLEX#1-#20MULTIPLE SOURCES
2Calcineurin-fusion Human endothelin receptor type-BCOMPLEX#11RECOMBINANT
3FKBP16COMPLEX#21RECOMBINANT
4Endothelin receptor type-BCOMPLEX#12RECOMBINANT
5CalcineurinCOMPLEX#12RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
11Homo sapiens (human)9606
22Homo sapiens (human)9606
33Homo sapiens (human)9606
44Homo sapiens (human)9606
55Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
11Spodoptera frugiperda (fall armyworm)7108
22Spodoptera frugiperda (fall armyworm)7108
33Escherichia coli (E. coli)562
44Spodoptera frugiperda (fall armyworm)7108
55Spodoptera frugiperda (fall armyworm)7108
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1600 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.33 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 134931 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0047453
ELECTRON MICROSCOPYf_angle_d0.60510095
ELECTRON MICROSCOPYf_dihedral_angle_d4.7151020
ELECTRON MICROSCOPYf_chiral_restr0.0411138
ELECTRON MICROSCOPYf_plane_restr0.0061279

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